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    <h1 style="text-align: center;">HTML5&lt;Day01&gt;</h1>
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    <h2>1 HTML 文档片段</h2>
    <h3>1.1 问题</h3>
    <p>创建如图1所示HTML界面</p>
    <h3>1.2 方案</h3>
    <p>方案1.2的文案内容</p>
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